to each.</p>
<p>Returns <code>true</code> if the event had listeners, <code>false</code> otherwise.</p>
<pre><code class="language-js"><span class="hl-4">import</span><span class="hl-2"> { </span><span class="hl-1">EventEmitter</span><span class="hl-2"> } </span><span class="hl-4">from</span><span class="hl-2"> </span><span class="hl-5">'node:events'</span><span class="hl-2">;</span><br/><span class="hl-0">const</span><span class="hl-2"> </span><span class="hl-3">myEmitter</span><span class="hl-2"> = </span><span class="hl-0">new</span><span class="hl-2"> </span><span class="hl-6">EventEmitter</span><span class="hl-2">();</span><br/><br/><span class="hl-7">// First listener</span><br/><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">on</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">, </span><span class="hl-0">function</span><span class="hl-2"> </span><span class="hl-6">firstListener</span><span class="hl-2">() {</span><br/><span class="hl-2"> </span><span class="hl-1">console</span><span class="hl-2">.</span><span class="hl-6">log</span><span class="hl-2">(</span><span class="hl-5">'Helloooo! first listener'</span><span class="hl-2">);</span><br/><span class="hl-2">});</span><br/><span class="hl-7">// Second listener</span><br/><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">on</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">, </span><span class="hl-0">function</span><span class="hl-2"> </span><span class="hl-6">secondListener</span><span class="hl-2">(</span><span class="hl-1">arg1</span><span class="hl-2">, </span><span class="hl-1">arg2</span><span class="hl-2">) {</span><br/><span class="hl-2"> </span><span class="hl-1">console</span><span class="hl-2">.</span><span class="hl-6">log</span><span class="hl-2">(</span><span class="hl-5">`event with parameters </span><span class="hl-0">${</span><span class="hl-1">arg1</span><span class="hl-0">}</span><span class="hl-5">, </span><span class="hl-0">${</span><span class="hl-1">arg2</span><span class="hl-0">}</span><span class="hl-5"> in second listener`</span><span class="hl-2">);</span><br/><span class="hl-2">});</span><br/><span class="hl-7">// Third listener</span><br/><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">on</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">, </span><span class="hl-0">function</span><span class="hl-2"> </span><span class="hl-6">thirdListener</span><span class="hl-2">(...</span><span class="hl-1">args</span><span class="hl-2">) {</span><br/><span class="hl-2"> </span><span class="hl-0">const</span><span class="hl-2"> </span><span class="hl-3">parameters</span><span class="hl-2"> = </span><span class="hl-1">args</span><span class="hl-2">.</span><span class="hl-6">join</span><span class="hl-2">(</span><span class="hl-5">', '</span><span class="hl-2">);</span><br/><span class="hl-2"> </span><span class="hl-1">console</span><span class="hl-2">.</span><span class="hl-6">log</span><span class="hl-2">(</span><span class="hl-5">`event with parameters </span><span class="hl-0">${</span><span class="hl-1">parameters</span><span class="hl-0">}</span><span class="hl-5"> in third listener`</span><span class="hl-2">);</span><br/><span class="hl-2">});</span><br/><br/><span class="hl-1">console</span><span class="hl-2">.</span><span class="hl-6">log</span><span class="hl-2">(</span><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">listeners</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">));</span><br/><br/><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">emit</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">, </span><span class="hl-8">1</span><span class="hl-2">, </span><span class="hl-8">2</span><span class="hl-2">, </span><span class="hl-8">3</span><span class="hl-2">, </span><span class="hl-8">4</span><span class="hl-2">, </span><span class="hl-8">5</span><span class="hl-2">);</span><br/><br/><span class="hl-7">// Prints:</span><br/><span class="hl-7">// [</span><br/><span class="hl-7">// [Function: firstListener],</span><br/><span class="hl-7">// [Function: secondListener],</span><br/><span class="hl-7">// [Function: thirdListener]</span><br/><span class="hl-7">// ]</span><br/><span class="hl-7">// Helloooo! first listener</span><br/><span class="hl-7">// event with parameters 1, 2 in second listener</span><br/><span class="hl-7">// event with parameters 1, 2, 3, 4, 5 in third listener</span>
</code><button>Copy</button></pre>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span><a id="emit.emit-1.K-2" class="tsd-anchor"></a><span class="tsd-kind-type-parameter">K</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></span></li><li><span><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">AnyRest</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4><div class="tsd-comment tsd-typography"><h4>Since</h4><p>v0.1.26</p>
to each.</p>
<p>Returns <code>true</code> if the event had listeners, <code>false</code> otherwise.</p>
<pre><code class="language-js"><span class="hl-4">import</span><span class="hl-2"> { </span><span class="hl-1">EventEmitter</span><span class="hl-2"> } </span><span class="hl-4">from</span><span class="hl-2"> </span><span class="hl-5">'node:events'</span><span class="hl-2">;</span><br/><span class="hl-0">const</span><span class="hl-2"> </span><span class="hl-3">myEmitter</span><span class="hl-2"> = </span><span class="hl-0">new</span><span class="hl-2"> </span><span class="hl-6">EventEmitter</span><span class="hl-2">();</span><br/><br/><span class="hl-7">// First listener</span><br/><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">on</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">, </span><span class="hl-0">function</span><span class="hl-2"> </span><span class="hl-6">firstListener</span><span class="hl-2">() {</span><br/><span class="hl-2"> </span><span class="hl-1">console</span><span class="hl-2">.</span><span class="hl-6">log</span><span class="hl-2">(</span><span class="hl-5">'Helloooo! first listener'</span><span class="hl-2">);</span><br/><span class="hl-2">});</span><br/><span class="hl-7">// Second listener</span><br/><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">on</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">, </span><span class="hl-0">function</span><span class="hl-2"> </span><span class="hl-6">secondListener</span><span class="hl-2">(</span><span class="hl-1">arg1</span><span class="hl-2">, </span><span class="hl-1">arg2</span><span class="hl-2">) {</span><br/><span class="hl-2"> </span><span class="hl-1">console</span><span class="hl-2">.</span><span class="hl-6">log</span><span class="hl-2">(</span><span class="hl-5">`event with parameters </span><span class="hl-0">${</span><span class="hl-1">arg1</span><span class="hl-0">}</span><span class="hl-5">, </span><span class="hl-0">${</span><span class="hl-1">arg2</span><span class="hl-0">}</span><span class="hl-5"> in second listener`</span><span class="hl-2">);</span><br/><span class="hl-2">});</span><br/><span class="hl-7">// Third listener</span><br/><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">on</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">, </span><span class="hl-0">function</span><span class="hl-2"> </span><span class="hl-6">thirdListener</span><span class="hl-2">(...</span><span class="hl-1">args</span><span class="hl-2">) {</span><br/><span class="hl-2"> </span><span class="hl-0">const</span><span class="hl-2"> </span><span class="hl-3">parameters</span><span class="hl-2"> = </span><span class="hl-1">args</span><span class="hl-2">.</span><span class="hl-6">join</span><span class="hl-2">(</span><span class="hl-5">', '</span><span class="hl-2">);</span><br/><span class="hl-2"> </span><span class="hl-1">console</span><span class="hl-2">.</span><span class="hl-6">log</span><span class="hl-2">(</span><span class="hl-5">`event with parameters </span><span class="hl-0">${</span><span class="hl-1">parameters</span><span class="hl-0">}</span><span class="hl-5"> in third listener`</span><span class="hl-2">);</span><br/><span class="hl-2">});</span><br/><br/><span class="hl-1">console</span><span class="hl-2">.</span><span class="hl-6">log</span><span class="hl-2">(</span><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">listeners</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">));</span><br/><br/><span class="hl-1">myEmitter</span><span class="hl-2">.</span><span class="hl-6">emit</span><span class="hl-2">(</span><span class="hl-5">'event'</span><span class="hl-2">, </span><span class="hl-8">1</span><span class="hl-2">, </span><span class="hl-8">2</span><span class="hl-2">, </span><span class="hl-8">3</span><span class="hl-2">, </span><span class="hl-8">4</span><span class="hl-2">, </span><span class="hl-8">5</span><span class="hl-2">);</span><br/><br/><span class="hl-7">// Prints:</span><br/><span class="hl-7">// [</span><br/><span class="hl-7">// [Function: firstListener],</span><br/><span class="hl-7">// [Function: secondListener],</span><br/><span class="hl-7">// [Function: thirdListener]</span><br/><span class="hl-7">// ]</span><br/><span class="hl-7">// Helloooo! first listener</span><br/><span class="hl-7">// event with parameters 1, 2 in second listener</span><br/><span class="hl-7">// event with parameters 1, 2, 3, 4, 5 in third listener</span>
</code><button>Copy</button></pre>
</div><section class="tsd-panel"><h4>Type Parameters</h4><ul class="tsd-type-parameter-list"><li><span><a id="emit.emit-1.K-2" class="tsd-anchor"></a><span class="tsd-kind-type-parameter">K</span></span></li></ul></section><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul class="tsd-parameter-list"><li><span><span class="tsd-kind-parameter">eventName</span>: <span class="tsd-signature-type">string</span><span class="tsd-signature-symbol"> | </span><span class="tsd-signature-type">symbol</span></span></li><li><span><code class="tsd-tag ts-flagRest">Rest</code> <span class="tsd-signature-symbol">...</span><span class="tsd-kind-parameter">args</span>: <span class="tsd-signature-type">AnyRest</span></span></li></ul></div><h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4><div class="tsd-comment tsd-typography"><h4>Since</h4><p>v0.1.26</p>